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A concerned man calls 911 to say he's on the phone with his girlfriend, and she's in trouble. When police respond, her two frightened sons answer the door. Their mom has been beaten severely. Detectives soon unveil a tale of obsession and violence.

Two distraught women call 911 when they discover their sister brutally murdered. Soon, detectives uncover a stunning surprise and struggle to find a killer whose self-hatred drove him to commit the ultimate sin, in a precedent- setting case.

Cleveland 911 receives a call from a panicked woman saying a mysterious man forced his way into her home and shot her boyfriend in front of their kids. Detectives have to untangle a twisted web of jealousy to find out who killed this young father and why.

When a man calls 911 screaming for help but too terrified to give his address, police scramble to find him. As detectives investigate, they uncover a shocking tale of torture and revenge one that proves that unrequited love can be deadly.